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首页> 外文期刊>Fuel >Performance characteristics of a compression-ignition engine using direct-injection ammonia-DME mixtures
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Performance characteristics of a compression-ignition engine using direct-injection ammonia-DME mixtures

机译：使用直接喷射氨DME混合物的压燃式发动机的性能特征

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Combustion and emissions characteristics of a compression-ignition engine using mixtures of ammonia and dimethyl ether (DME) are investigated. Ammonia can be regarded as a carbon-free fuel and is one of the world's most synthesized chemicals. Its infrastructure is well established and it can be produced from renewable resources, making it an attractive energy carrier. In this study, a high-pressure mixing system is developed for blending liquid ammonia with DME, the latter serving to initiate combustion. The present engine uses a modified injection system without fuel return to prevent fuel mixture from vaporizing. Results using different mixtures of ammonia and DME show that ammonia causes longer ignition delays and limits the engine load conditions due to its high autoignition temperature and low combustion rate (e.g., flame speed). The inclusion of ammonia in the fuel mixture also decreases combustion pressure and temperature, resulting in higher CO and HC emissions. NO_X emissions also increase due to the formation of fuel NO_x when ammonia is used. However, improvements for the same operating conditions can be achieved by increasing the injection pressure. Exhaust ammonia emissions is on the order of hundreds of ppm under most of the conditions studied. Soot emissions are extremely low for all cases studied. Double injection schemes are also employed and their effects on the exhaust emissions vary with operating conditions.
机译：研究了使用氨和二甲醚（DME）混合物的压燃式发动机的燃烧和排放特性。氨可被视为无碳燃料，是世界上合成度最高的化学物质之一。它的基础设施完善，可以使用可再生资源生产，使其成为有吸引力的能源载体。在这项研究中，开发了一种高压混合系统，用于将液氨与DME混合，后者可引发燃烧。本发动机使用没有燃料返回的改进的喷射系统，以防止燃料混合物汽化。使用氨和DME的不同混合物的结果表明，氨由于其较高的自燃温度和较低的燃烧速率（例如火焰速度），会导致更长的点火延迟并限制发动机负载条件。燃料混合物中包含氨气也会降低燃烧压力和温度，导致更高的CO和HC排放量。当使用氨水时，由于形成燃料NO_x，NO_X排放也会增加。但是，可以通过增加喷射压力来实现相同工况的改进。在大多数研究条件下，氨气排放量约为数百ppm。在所有研究的案例中，烟尘排放量都非常低。还采用了双喷射方案，它们对废气排放的影响随运行条件而变化。

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